Simple HTML and CSS

Naming files and directories

I always put ".htm" at the end of the filenames,
a legacy from the MSDOS era. ".html" is allowed,
but ".htm" works just as well, so why bother?

To delimit folder names (directory names), always
use slashes (/), never backslashes (\). Backslashes are a Windows
thing, but Internet existed long before Windows was even invented.
Most web servers also use Unix (Linux,
Free BSD, etc.), and in a
Unix system folders are delimited by slashes (/).
Browsers written for Windows can also handle slashes quite well.